Maria Koletta

Interference and compatibility issues between the mobile satellite service and the fixed service in the Ku band

This paper examines the potential interference between the mobile satellite service and the fixed service in the Ku band. At first, the aggregate and the single-entry interference criteria for the terrestrial fixed service stations are calculated. Then, all the parameters that influence the interference magnitude are presented and extensively analyzed. In order to evaluate the impact of each one of them in the interference calculations, different scenarios are taken into consideration and simulations are conducted. The results are thoroughly presented and analyzed.

Determination of the coordination area for mobile earth stations operating with geostationary space stations in the frequency bands shared with the terrestrial services

This paper examines the development of the coordination contour for mobile (except aeronautical mobile) earth stations operating in frequency bands shared with the terrestrial services. The method used today by the national administrations for developing the coordination contour around these stations is vague and leads to unnecessarily large coordination areas. A new method of calculating the coordination contour is proposed for this type of stations. Its application to realistic scenarios leads to interesting results.

A new methodology for the determination of the co‐ordination area around stations of the fixed service (FS) with respect to mobile Earth stations on board vessels (ESVs)

The extensive use of Earth stations located on board sea going vessels (ESVs) has created the necessity for the development of a new type of co-ordination area around the fixed service receivers (FSRs) operating in frequency bands C and Ku. To date there is not a single method concerning the calculation of the co-ordination area around the FSRs, which takes into account the mobility of the interfering stations. This paper addresses an in-depth analysis of the interference produced to the FSRs by the ESVs and proposes a new method for the development of the co-ordination area around the FSRs, taking into account parameters such as the velocity of the ESVs and their frequencies of passage from specific locations. Simulations performed for three different operational scenarios prove the validity of the new methodology. Copyright

The Effect of Mobility on The Interference Calculations between the Mobile Satellite Service and the Fixed Service

This paper addresses an in-depth analysis of the interference produced between the mobile satellite service (MSS) and the fixed service (FS) operating in the same frequency bands and proposes a new method (implemented in a Java-based program) for the development of coordination areas around the FS receivers, taking into account parameters such as the velocity of the mobile earth stations and their frequency of passage from specific locations. Simulations performed for two different operational scenarios show that its application and use by the national authorities can make the harmonic coexistence of the two services feasible.

Application of a new methodology for the coordination of the fixed service (FS) with mobile earth stations on board vessels in realistic interference conditions

This paper addresses an in-depth analysis of the interference produced to the fixed service (FS) by the earth stations on board vessels (ESVs) operating with geostationary satellites and proposes a new methodology for the development of coordination areas around the FS receivers, taking into account parameters such as the velocity of the ESVs and their frequency of passage from specific locations. Simulations performed in realistic interference conditions prove the validity of the new methodology, which can constitute the basis for the development of new methods for the coordination between the fixed service and the ESVs contributing, by this way, significantly to the harmonic coexistence of the two services.

High altitude platform's instability effect on co-channel interference levels when sharing the V band with terrestrial services

In this paper the effect of high altitude platforms instability on co-channel interference levels when sharing the V band with terrestrial services is analyzed. Simulation results characterizing the statistical behaviour of interference variations due to platforms instability are presented.

Application of a new method for the coordination of the Fixed Service Stations with the Earth Stations on Vessels (ESVs) in real interference scenarios

This paper examines the construction of the coordination contour around the stations of the conventional fixed service operating in the same frequency bands with the mobile Earth stations located on board vessels (ESVs). A new method for the realistic calculation of the coordination area is presented. This method takes into account the mobility parameters of the interfering stations such as their velocity and their frequency of passage from specific locations around the FS station and the specific interference conditions. Simulations in real interference environments prove its validity. Useful results for the coordination procedure between the two services are extracted and thoroughly discussed

Analysis of the Interference Environment Generated by Mobile Earth Stations Operating in Frequency Bands Shared with the Fixed Service

This paper examines the construction of the coordination contour for mobile (except aeronautical mobile) earth stations operating in frequency bands shared with the terrestrial services. The method used today by the national administrations for calculating the coordination contour around these stations is vague and leads to unnecessarily large coordination areas. A new method of developing the coordination contour is proposed for this type of stations. It is shown that the adoption of the method by the national administrations contributes considerably to the development and wide use of mobile earth stations and eases the harmonic coexistence of this service with the terrestrial services

Compatibility Analysis of High Altitude Platform Stations and Fixed Wireless Access Systems.

With the conclusion of the World Radiocommunication Conference 2003 (WRC-03), use of the 47 GHz and 48 GHz bands was permitted for the fixed service (FS) using high altitude platform stations (HAPS) worldwide. This paper examines the sharing and compatibility of the HAPS-based FS with the conventional FS systems using the same frequency bands and establishes the conditions of the coexistence with those services. Separation distances necessary for the harmonic co-existence of the two systems, are extracted through simulations performed under various realistic scenarios in urban, suburban and rural areas for different terrains.

Interference Studies between Mobile Satellite Service and Fixed Service in the Ku Band

This paper examines the potential interference between the Mobile Satellite Service and the Fixed Service in the Ku band. At first, the mobile satellite stations operating at sea are presented and the aggregate and the single-entry interference criteria for the terrestrial fixed service stations are calculated. Then, all the parameters that influence the interference magnitude are presented and extensively analyzed. In order to evaluate the impact of each one of them in the interference calculations, different scenarios are taken into consideration and simulations are conducted in maritime and terrestrial environment. The results are thoroughly presented and analyzed. I. INTRODUCTION The increasing demand for Mobile Satellite Services the last decades has lead to the fast development of cost effective mobile VSAT terminals and their extensive use for many applications. Mobile VSAT antennae can easily be installed on almost every vehicle including cars, small vans, trucks, sea going vessels and mobile platforms like cruise ships, ferries, geo seismic ships, drilling vessels and oil production platforms. Many of these systems operate in the C band (6/4 GHz), while there is a great interest for their deployment in the Ku band (14/11/12 GHz) (uplink in 13.75-14.5 GHz and downlink in 10.7-12.75 GHz frequency bands) in geographic areas covered by these bands. These mobile satellite systems are used to provide wideband satellite services, such as streaming video, bringing Internet connectivity to remote areas and carrying sensitive voice or data traffic. The transmitting bit rates may vary between 19.2 kbps up to 1.544 Mbps (Ref 1). However, according to the International Telecommunication Union (ITU) Regulations, the 13.75-14.5 GHz and 10.7-12.75 GHz frequency bands are exclusive for the Fixed Satellite Service (FSS) in all ITU regions and allocated for use to the terrestrial Fixed Service (FS) in many countries around the world through ITU footnotes. Hence, whichever frequencies of operation for the mobile earth stations are chosen in the Ku band, there is a possibility of interference, either the earth station transmission interfering with reception at the Fixed Service stations (in the 13.75-14.5 GHz frequency band), or the Fixed Service station transmissions interfering with reception at the mobile earth stations (in the 10.7-12.75 GHz frequency band). The magnitude of interference between two systems operating in the same or adjacent frequency bands depends on many factors, such as the transmission loss along the interfering path and the permissible interference levels at the receivers. For the terrestrial Fixed Service, long- and short-term interference criteria have been established in order to facilitate the sharing with the other systems operating in the same frequency bands. The possibility and the magnitude of the interference need to be examined in detail in each case, taking all these factors that influence the interference into account. In case of a mobile earth station, significance must be given also to the time variant nature of the interference. That means that additional parameters should be taken into ) ( ) (